Trowelling blade assemblies



P 1968 v. P. COLIZZA ET AL 3,402,647

TROWELLING BLADE AS SEMBLIES Filed Oct. 22, 1965 2 Sheets-Sheet 1 F I G3 INVENTOR. VINCENT P- COLIZZA FRANCESCO ZOCHIL PATENT AGENTS Sept. 24,1968 v. P. COLIZZA ET AL 3,402,647

TROWELLING BLADE ASSEMBLIES 2 Sheets-Sheet 2 Filed Oct. 22. 1965 FIG.5

INVENTOR. VINCENT P. COLIZZA FRANCESCO ZOCHIL (Zack @Pym PATE NT AGENTSUnited States Patent 3,402,647 TROWELUNG BLADE ASSEMELIES Vincent P.Coiizza, Burlington, Ontario, and Francesco Zochil, Hamilton, Ontario,Canada, assignors to Hamilton Float & Trowel Limited, Hamilton, Ontario,

Canada Filed Get. 22, 1965, Ser. No. 502,683 17 Claims. (Cl. 94-45)ABSTRACT OF THE DISCLGSURE A trowelling blade assembly for use with amotor-driven trowelling machine consists of the blade and two attachmentmembers fixed respectively to the blade and an arm of the machine;attaching means fastening the attachment members together comprise twospaced sets of cooperating pin means and slot means; at least oneattaching means of one set is movably mounted on the respectiveattaching member to engage it and disengage it from the other means ofthe same set; each set consists of one means on one member and twoalternatively engageable cooperating means on the other member to permitend-for-end reversal of the blade.

This invention relates to improvements in trowelling blade assembliesfor use with a trowelling machine, and more particularly to means whichenable trowelling blades to be readily attached to and detached frompower trowelling machines.

Power trowelling machines, also sometimes known as concrete finishingmachines, are now widely and commonly used for the smoothing andpolishing of cement surfaces, such as concrete floors. Such machinescomprise, for example, a motor which rotates a boss about a generallyvertically disposed axis, the boss having three, or sometimes four, armsspaced equiangularly around it and extending radially therefrom.

A trowelling blade is attached to each arm, and it has been commonpractice hitherto to simply bolt the blades directly to the arms, usingat least three bolts.

In a typical trowelling operation a roughly-smoothed cement surface istrowelled, using so-called fioat blades on the machine, to apredetermined degree of smoothness and density, as judged by theoperator. The float blades are then replaced by finish blades of smallerarea than the float blades andthe trowelling continued until the desiredpolished finish is obtained. The removal and replacement of the bladesto change them is a time consuming operation, particularly with machinesof the type that require removal of a guard ring that is usuallyprovided to protect the rotating blades against contact with stationaryobjects. Moreover, the blades wear relatively quickly, and mustfrequently be reversed or replaced, entailing another removal andreplacement operation.

Accordingly, it is an objectof the present invention to provide adetachable attaching means which permits quick and easy removal,installation and reversal of a trowelling blade associated therewith.

.In the operation of the machine it is subjected to considerablemechanical stress, and also becomes splattered with cement and similarrapidly hardening material. It has frequently been found with themachines known hitherto employing bolts as blade fastening means thatsome of this material deposits on the bolts and, in the course of anormal trowelling operation, becomes so hard that it makes removal ofthe bolts difficult, or even impossible without damaging the threadsthereof.

Accordingly, it is another object of the invention to provide'adetachable attaching means that is completely protected against theadverse effects of such deposited hardenable material.

ice

In accordance with the present invention there is provided a trowellingblade assembly for use with a trowelling machine, the assemblycomprising a trowelling blade having an upper surface and a workingsurface opposite to said upper surface, and means for detachablyattaching the blade to the trowelling machine, said attaching meanscomprising a first attachment member secured to and upstanding from theupper surface of the blade, a cooperating second attachment member forattachment to the trowelling machine, a first set of two cooperatingattaching means carried respectively by the said two attachment membersand engaging one another to detachably attach the members together, anda second-set of cooperating attaching means spaced from the first set,the second set comprising a fixed attaching means fixedly carried by thefirst attachment member and a movable attaching means movably carried bythe second attachment member, the last-mentioned two attaching meansengaging one another to detachably attach the attachment memberstogether, the said movable attaching means comprising a movable membermounted by the second attachment member for longitudinal movement forengagement with and disengagernent from the said fixed attaching means,and also mounted thereby for movement transverse to the saidlongitudinal movement for releasably locking the cooperating attachingmeans to one another, and moving and locking means operatively engagedwith the movable member for producing the said longitudinal andtransverse releasable locking movements thereof.

Particular preferred embodiments of the invention will now be described,by way of example, with reference to the accompanying drawings wherein:

FIGURE 1 is a view from above showing a plurality of trowelling bladesmounted on blade holders, the holders being connected to a collar thatis adapted to be driven by the driving shaft of the motor of atrowelling machine,

FIGURE 2 is an exploded perspective view showing a trowelling bladeassembly that is a first embodiment of this invention,

FIGURE 3 is a sectional view, taken on the line 33 of FIGURE 2, andshowing the manner in which the trowelling blade of FIGURE 2 is attachedto its blade holder,

FIGURE 4 is a view similar to FIGURE 2 of a second embodiment, and

FIGURE 5 is a view similar to FIGURE 3, and taken on the line 55 ofFIGURE 4.

Corresponding parts of all the figures of the drawing will be given thesame reference number.

FIGURE 1 illustrates the general blade arrangement of a motor driventrowelling machine, wherein the three blades 10 are detachably connectedto respective arms 11 of the machine, the arms being connected to a boss12 that is mounted on the output shaft 13 of the machine, whereby theblades 10 can be rotated by the machine in a horizontal plane. Theblades are mounted at equal angles of 120 (this angle would be for afour blade machine) and may be float blades which are used for generalsmoothing of a cement surface, finishing blades which are used to imparta very smooth finish to an already smoothed surface, or combinationblades which are used for both purposes. A guard ring 14 is provided onthe machine to protect the blades against contact with surroundingobjects, e.g., walls and pillars, while the machine is in use.

Referring now especially to FIGURES 2 and 3, it will be seen that eachblade 10 is generally rectangular as seen in plan having an uppersurface 15, a working surface 16 disposed opposite to and thereforeunderneath the upper surface 15, two straight parallel longer sides 17and two straight parallel shorter ends 18. The two end portions of theblade are inclined slightly upward to prevent the corners of the bladesdigging into the surface being smoothed as the machine is in use.

Attaching means for detachably connecting together the blade and theassociated machine arm 11 comprise a first member 19 which in thisembodiment is of generally U-shaped channel form, having the base 19a ofthe channel fastened to the upper surface 16 of the blade by suitablefastening devices 20, such as rivets, and the two spaced sides 19b ofthe channel extending generally perpendicular to the face 16. Thechannel member extends as nearly as possible the full length of theblade and is positioned centrally with respect to the sides 17 and ends18 thereof, so that its longitudinal axis is generally parallel to thelonger sides 17. Such a member is very rigid in relation to its weight,as compared with the fiat blade 10, and this rigidity is imparted to theblade 10, permitting the employment of thinner material for the bladethan has been common hitherto. To this end also pairs of transverselyspaced rivets 20 are employed, such a disposition making the bladeassembly more rigid than if a single row of fastening devices areemployed, as in the trowel devices used commercially hitherto.

The attaching means also comprise a second member 21 which is attachedto the associated arm 11 by bolts 22, and serves as a supportingconnection between the arm and the neighboring part of the guard ring14. This member 21 is in this embodiment also of generally U-shapedchannel form, having its base 21a fastened to the arm 11, and the twospaced longer sides 21b extending generally parallel to the longer sides19b of the member 19. The ends of the channel are closed by respectiveshorter end walls 210. The relative dimensions of the two members 19 and21 are such that with the two member attached together the member 19 iscompletely enclosed in a chamber constituted by the member 21 and theadjacent part of the blade 10, the side walls 21b and end walls 210extending down as closely as possible to the adjacent part of the topsurface 15 of the blade. The means for detachably attaching the twomembers together, which means will be described in greater detail below,are completely enclosed within this chamber and thereby protected fromthe deposit thereon of cement splatters and particles produced byoperation of the machine.

The two members are detachably attached together in accordance with thisinvention by two longitudinally spaced pin and notch means. In thisparticular embodiment the first of these pin and notch means comprise afirst pin 22 which is mounted in suitable apertures in the member 21,extending perpendicular to the side walls 21b,

and retained therein against endwise movement, for ex- 0 ample byheading. This first pin means 22 cooperates with associated first notchmeans, constituted by two spaced notches 23 in the adjacent end of themember 19, these notches extending longitudinally of the walls 1% andreceiving the pin 22 for attaching engagement upon relative endwisemovement of the two members.

The second pin attaching means comprise a second pin 24 mounted insuitable apertures in the member 19, eX- tending perpendicular to theside walls 191), and retained therein in a similar manner to the pin 22.The cooperating second slotted means is constituted by a single slot 25,provided in the head 26 of a bolt 27. The bolt shank has fiat flanks27a, so that it is of noncircular cross-section, the shank extendingthrough a correspondingly shaped hole in a blade spring member 28, anelongated slot 29 in the base 210 of the member 21, a correspondinglyshaped hole in a cover member 30, and being threadedly engaged in a nut31 that is adapted to be rotated by hand. The second slotted meansconstituted by the slot are thus capable of endwise movement relative toits associated member 21 for the required attaching engagement with, anddisengagement from, the cooperating second pin 24.

The operation of attaching a trowel blade to the ma- 4 chine isillustrated generally by FIGURE 3 and is as follows:

The nut 31 is rotated to move the head 26 downwards under the downwardbias of the bowed spring member 28,

rotation of the bolt being prevented by its engagement in the slot 29.The blade is moved endwise from the position shown in broken lines inFIGURE 3, in the direction of the arrow 32, until the slots 23 areattachably engaged with the pin 22; the blade is then rotated in thedirection of the arrow 33 until it is fully home with the member 19enclosed within the member 21; thereafter the assembly comprising thebolt 27, the nut 31 and the associated members 28 and 3d are movedtogether in the direction of the arrow 34 until the slot 25 is inattaching engagement with the pin 24; finally the nut 31 is rotated totighten the engagement of the attaching means against the bias of thespring member 28, until the two members 19 and 21 are securely fastenedtogether. The blade is removed by reversing the above-described sequenceof operations.

The dimensions of the cover member 30 are such that with the bolt 26 inits endmost position, as illustrated by FIGURE 3, the member 30completely covers the slot 29, and effectively prevents the entry ofcement splatter, etc., to the interior of the compartment enclosing thefastening means.

In operation of the machine the leading edges of the blades are wornvery much faster than the trailing edges, and the effective life of theblade can be increased if the fastening means permit the blade to beturned end-forend. In the blades in accordance with this invention thisis accomplished by providing on the trowel member 19 a a suitablylocated further pin 35, constituting another second pin means forcooperation with the second slotted means, and two spaced slots 36 inthe other end of the member, constituting another first slotted meansfor cooperation with the first pin means 22.

Referring now to FIGURES 4 and 5, the second embodiment illustratedtherein has the same first member 19 and second member 21, and the samefirst pin means 22 and first slotted means 23 for detachably attachingthe two members together. In this embodiment however a differentarrangement of second pin and slotted means is provided, the second pinmeans being constituted by a single pin 37 mounted in the head 26 of thebolt 27 to extend transverscly of the members 19 and 21, parallel to thefirst pin 22, and the second slotted means being constituted by twospaced, generally T-shaped slots 38, the upright of the T of each slotopening at the free edge of the respective side wall, and the cross barof the T extending oppositely towards the ends of the respective channelmember 19.

In mounting the trowel blade on the machine, after engagement of the pin22 and the slots 23, the assembly comprising the bolt 27 the pin 37 etc.are withdrawn until the pin can be inserted through the uprights of thetwo corresponding T shaped slots. Thereafter, with the two members 19and 21 in close engagement, the assembly is moved in the direction ofthe arrow 34 to engage the pin 37 beneath the corresponding overhangingportions of the member 19. As with the first embodiment, another secondslot means 39 is provided, corresponding to the second slot means 38, topermit the trowel blade to be turned end-for-end when required. It willbe apparent that for the purposes of the present mvention the slots 38and 39 could be of general L-shape with one leg opening to the freeedges of the member 19 and the other leg extending towards theimmediately adjacent end of the member. By the provision of T shapeslots it is possible, if desired, to also use the trowel blade of thepresent invention in association with the fastening means specificallydescribed and claimed in the copending application of Luigi Cagno, No.405,552, filed October 21, 1964, and assigned to the same assignee.

It will be apparent to those skilled in the art that various changes andmodifications may be made to the cmbodiments described, and otherembodiments are possible, within the scope of the appended claims.

What we claim is:

1. A trowelling blade assembly for use with a trowelling machine, theassembly comprising a trowelling blade having an upper surface and aworking surface opposite to said upper surface, andmeans for detachablyattaching the blade to the trowelling machine, said attaching meanscomprising a first attachment member (19) secured to and upstandingfromthe upper surface of the blade, a cooperating second attachment member(21) of channel crosssection with an elongated slot (29) in the basewall thereof and with both of the channel ends closed, the channel beingopen towards the blade with its side and end walls extending into theclose neighbourhood of the upper surface of the blade to constitutetherewith an enclosure enclosing the first attachment member, a firstset of two c0- operating attaching means (22, 23, 36) carriedrespectively by the said two attachment members and engaging one anotherwithin the said enclosure to detachably attach the members together, anda second set of cooperating attaching means (24, 25, 36 or 37, 33, 39)spaced from the first set, the second set comprising a fixed attachingmeans (24, or 38, 39) fixedly carried by the first attachment member anda movable attaching means (25 or 37) movably carried by the secondattachment member, the last-mentioned two attaching means engaging oneanother within the said enclosure to detachably attach the attachmentmembers together, the said movable attaching means comprising a movablescrewthreaded member (27) mounted in the said slot for longitudinalmovement in the direction of elongation thereof for engagement with anddisengagement from the said fixed attaching means, and also mounted inthe slot for movement towards and away from the blade for releasablylocking the cooperating attaching means to one another, a nut (31)screw-threadably engaged with the screwthreaded member and producing thesaid releasable locking movement thereof upon rotation of the nut, andcover means movable with the screw-threaded member and closing the partof the slot not occupied by the lastmentioned member to prevent passageof material through the slot to the interior of the enclosure.

2. A trowelling blade assembly as claimed in claim 1, wherein the saidmovable attaching means comprise a slotted member (26) carried by thesaid screw-threaded member (27) and the cooperating fixed attachingmeans comprise a pin (24 or carried by the first attachment member, theslotted member having the slot (25) thereof lockably engaged with anddisengaged from the pin by the said longitudinal and locking movementsof the screw-threaded member, the pin being mounted by the firstattachment member to extend transversely of the directions of saidlongitudinal and locking movements of the screw-threaded member.

3. A trowelling blade assembly as claimed in claim 1, wherein the saidmovable attaching means comprise a slotted member (26) carried by thesaid screw-threaded member (27) and the cooperating fixed attachingmeans comprise a pin (24 or 35) carried by the first attachment member,the slotted member having the slot (25) thereof lockably engaged withand disengaged from the pin by the said longitudinal and lockingmovements of the screwthreaded member, wherein the said first attachmentmember (19) is of channel section having two spaced sidewalls (19b)upstanding from the upper surface of the blade, and wherein the said pin(24 or 35) is mounted by and extends between the said spaced upstandingsidewalls.

4. A trowelling blade assembly as claimed in claim 1, wherein the-saidmovable attaching means comprise a pin member. (26, 37) carried by thesaid screw-threaded member (27 and the cooperating fixed attaching meanscomprise generally L-sha ed slot means (38, 39) carried by the firstattachment member, thepin member having the pin (37) thereof lockablyengaged with and disengaged from the slot means by the said longitudinaland locking movements of the screw-threaded member, the said slot meanshaving a vertically extending entry portion and a horizontally extendingportion connected to said entry portion, the pin being engaged in saidhorizontally extending portion for the said locking engagement with theslot means.

5. A trowellng blade assembly as claimed in claim 1, wherein the saidmovable attaching means comprise a pin member 2s, 37) carried by thesaid screw-threaded member (27) and the cooperating fixer attachingmeans comprise generally L-shaped slot means (38, 39) carried by thefirst attachment member, the pin member having the pin thereof lockablyengaged with and disengaged from the slot means by the said longitudinaland locking movements of the screw-threaded member, wherein the saidfirst attachment member (15 is of channel section having two spacedsidewalls (19b) upstanding from the upper surface of the blade, andwherein the said slot means comprise respective parallel slots in therespective channel sidewalls, each slot having a vertically extendingentry portion and a horizontally-extending portion connected to saidentry portion, the pin being engaged in the horizontally extendingportion for the said locking engagement with the slots.

6. A trowelling blade assembly as claimed in claim 1, wherein the twoattaching means (22 and 23, 36) of the said first set are fixedlycarried by their respective attachment members, and are attachablyengaged with and detached from one another by movement relative to oneanother of the two attachment members.

7. A trowelling blade assembly as claimed in claim 1, wherein theattaching means of the first set comprise a pin member (22) fixedlycarried by the second attachment member (21) and the first attachmentmember (19) is provided with end slots (23, 36) at the two opposite endsthereof, the said end slots being selectively engageable with thelast-mentioned pin member (22) to permit reversal of the bladeend-for-end, and wherein the attaching means of the second set comprisea pair of spaced pins (24, 35) fixedly carried by the first attachmentmember (19) and each constituting a respective fixed attachment means,and a movable slotted member (25, 26) carried by the said screw-threadedmember (27) and selectively engageable with a corresponding one of thlast-mentioned pin means (24, 35) when the blade is reversedend-for-end.

8. A trowelling blade assembly as claimed in claim 1, wherein theattaching means of the first set comprise a pin member (22) fixedlycarried by the second attachment member (21) and the first attachmentmember (19) is provided with end slots (23, 36) at the two opposite endsthereof, the said end slots being selectively engageable with thelast-mentioned pin member to permit reversal of the blade end-for-end,and wherein the attaching means of the second set comprise a pair ofspaced slot means (38, 39) fixedly carried by the first attachmentmember (19) and each constituting a respective fixed attachment means,and a movable pin member (26, 37) carried by the said screw-threadedmember (27 and selectively engageable with a corresponding one of thesaid slot means (38, 39) when the blade is reversed endfor-end.

9. A trowelling blade assembly for use with a trowelling machine, theassembly comprising a trowelling blade having an upper surface and awork-ing surface opposite to said upper surface, and means fordetachably attaching the blade to the trowelling machine, said attachingmeans comprising a first attachment member (19) secured to andupstanding from the upper surface of the blade, a cooperating secondattachment member (21) for attach ment to the trowelling machine, afirst set of two cooperating attaching means (22, 23, 36) carriedrespectively by the said two attachment members and engaging one anotherto detachably attach the members together, and a second set ofcooperating attaching means (24, 25, 36 or 37, 38, 39) spaced from thefirst set, the second set comprising a fixed attaching means (24, 25 or38, 39) fixedly carried by the first attachment member and a movableattaching means (25 or 37) movably carried by the second attachmentmember, the last-mentioned two attaching means engaging one another todetachably attach the attachment members together, the said movableattaching means comprising a movable member (27) mounted by the secondattachment member for longitudinal movement for engagement with anddisengagement from the said fixed attaching means, and also mountedthereby for movement towards and away from the blade for releasablylocking the cooperating attaching means to one another, and moving andlocking means (31) operatively engaged with the movable member forproducing the said longitudinal and releasable locking movementsthereof.

10. A trowelling blade assembly for use with a trowelling machine, theassembly comprising a trowelling blade having an upper surface and aworking surface opposite to said upper surface, and means for detachablyattaching the blade to the trowelling machine, said attaching meanscomprising a first attachment member (19) secured to and upstanding fromthe upper surface of the blade, 21 cooperating second attachment member(21) for attachment to the trowelling machine, a first set of twocooperating attaching means (22, 23, 36) carried respectively by thesaid two attachment members and engaging one another to detachablyattach the members together, and a second set of cooperating attachingmeans (24, 25, 36 or 37, 38, 39) spaced from the first set, the secondset comprising a fixed attaching means (24, 25 or 38, 39) fixedlycarried by the first attachment member and a movable attaching means (25or 37) movably carried by the second attachment member, thelast-mentioned two attaching means engaging one another to detachablyattach the attachment members together, the said movable attaching meanscomprising a movable screw-threaded member (27) mounted by the secondattachment member for longitudinal movement for engagement with anddisengagement from the said fixed attaching means, and also mountedthereby for vertical movement for releasably locking the cooperatingattaching means to one another, and nut means (31) screw-threadablyengaged with the screw-threaded member and producing the said releasablelocking movement upon rotation thereof.

11. A trowelling blade assembly as claimed in claim 10, wherein the saidmovable attaching means comprise a slotted member (26) carried by thesaid screw-threaded member (27) and the cooperating fixed attachingmeans comprise a pin (24 or 35) carried by the first attachment member,the slotted member having the slot (25) thereof lockably engaged withand disengaged from the pin by the said longitudinal and lockingmovements of the screwthreaded member, the pin being mounted by thefirst attachment member to extend transversely of the directions of saidlongitudinal and locking movements of the screw-threaded member.

12. A trowelling blade assembly as claimed in claim 10, wherein the saidmovable attaching means comprise a slotted member (26) carried by thesaid screw-threaded member (27 and the cooperating fixed attaching meanscomprise a pin (24 or 35) carried by the first attachment member, theslotted member having the slot (25) thereof lockably engaged with anddisengaged from the pin by the said longitudinal and locking movementsof the screwthreaded member, wherein the said first attachment member(19) is of channel section having two spaced sidewalls (19b) upstandingfrom the upper surface of the blade, and wherein the said pin (24 or 35)is mounted by and extends between the said spaced upstanding sidewalls.

13. A trowelling blade assembly as claimed in claim 10 wherein the saidmovable attaching means comprises a pin member (26, 37) carried by thesaid screw-threaded member (27) and the cooperating fixed attachingmeans comprise generally L-shaped slot means (38, 39) carried by thefirst attachment member, the pin member having the pin (37) thereoflockably engaged with and disengaged from the slot means by the saidlongitudinal and locking movements of the screw-threaded member, thesaid slot means having a vertically/extending entry portion and ahorizontally/extending portion connected to said entry portion, the pinbeing engaged in said horizontally extending portion for the saidlocking engagement with the slot means.

14. A trowelling blade assembly as claimed in claim 10, wherein the saidmovable attaching means comprise a pin member (26, 37 carried by thesaid screw-threaded member (27) and the cooperating fixed attachingmeans comprise generally L-shaped slot means (38, 39) carried by thefirst attachment member, the pin member having the pin thereof lockablyengaged with and disengaged from the slot means by the said longitudinaland locking movements of the screw-threaded member, wherein the saidfirst attachment member (19) is of channel section having two spacedsidewalls (19b) upstanding from the upper surface of the blade, andwherein the said slot means comprise respective parallel slots in therespective channel sidewalls, each slot having a vertically/extendingentry portion and a horizontally/extending portion connected to saidentry portion, the pin being engaged in the horizontally/extendingportion for the said locking engagement with the slots.

15. A trowelling blade assembly as claimed in claim 10, wherein the twoattaching means (22 and 23, 36) of the said first set are fixedlycarried by their respective attachment members, and are attachablyengaged with and detached from one another by movement relative to oneanother of the two attachment members.

16. A trowelling blade assembly as claimed in claim 10, wherein theattaching means of the first set comprise a pin member (22) fixedlycarried by the second attachment member (21) and the first attachmentmember (19) is provided with end slots (23, 36) at the two opposite endsthereof, the said end slots being selectively engageable with thelast-mentioned pin member (22) to permit reversal of the bladeend-for-end, and wherein the attaching means of the second set comprisea pair of spaced pins (24, 35) fixedly carried by the first attachmentmember (19) and each constituting a respective fixed attachment means,and a movable slotted member (25, 26) carried by the said screw-threadedmember (27) and selectively engageable with a corresponding one of thelast-mentioned pin means (24, 35 when the blade is reversed end-for-end.

17. A trowelling blade assembly as claimed in claim 10, wherein theattaching means of the first set comprise a pin member (22) fixedlycarried by the second attachment member (21) and the first attachmentmember (19) is provided with end slots (23, 36) at the two opposite endsthereof, the said end slots being selectively engageable with thelast-menioned pin member to permit reversal of the blade end-for-end,and wherein the attaching means of the second set comprise a pair ofspaced slot means (38, 39) fixedly carried by the first attachmentmember (19) and each constituting a respective fixed attachment means,and a movable pin member (26, 37) carried by the said screw-threadedmember (27) and selectively engageable with a corresponding one of thesaid slot means (38, 39) when the blade is reversed end-for end.

References Cited UNITED STATES PATENTS 3,296,946 1/1967 Cagno 94-453,066,332 12/1962 Sedlacek l4--27 JACOB L. NACKENOFF, Primary Examiner.

